Update.

test/udp/bind.wren

@@ -0,0 +1,11 @@
+// retoor <retoor@molodetz.nl>
+
+import "udp" for UdpSocket
+
+var socket = UdpSocket.new()
+socket.bind("127.0.0.1", 0)
+
+System.print(socket.localAddress) // expect: 127.0.0.1
+System.print(socket.localPort > 0) // expect: true
+
+socket.close()